Calibre Test Profiles allow you to specify an emulated device and network throttling for your tests. Until today, all device and network throttling was applied during runtime, meaning that the throttling was applied to the browser as it was running the test.
Google’s PageSpeed Insights uses a different approach. It runs page tests at full, unthrottled speed, then performs a simulation of the throttling that would have been applied to the page load.
Today, we have added a new option to Calibre Test Profiles that allows you to run your tests with the same simulated throttling as PageSpeed Insights. Now, there are two new Test Profile options:
- PageSpeed Desktop
- PageSpeed Mobile
These two device options will run your tests with the same throttling settings as PageSpeed Insights. While we don't recommend comparing monitoring from different tools, this option will allow you to compare your Calibre tests with PageSpeed Insights tests more closely as the test conditions will be more similar.
To start testing with PageSpeed simulated throttling, create or update an existing Test Profile in Site → Settings → Test Profiles.